Add SCons configure checks

[senf.git] / boost_ext / boost / multi_index / detail / prevent_eti.hpp

diff --git a/boost_ext/boost/multi_index/detail/prevent_eti.hpp b/boost_ext/boost/multi_index/detail/prevent_eti.hpp
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+/* Copyright 2003-2005 Joaquín M López Muñoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
+#define BOOST_MULTI_INDEX_DETAIL_PREVENT_ETI_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/detail/workaround.hpp>
+
+#if BOOST_WORKAROUND(BOOST_MSVC,<1300)
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/integral_c.hpp>
+#include <boost/mpl/aux_/msvc_never_true.hpp>
+#endif
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+#if BOOST_WORKAROUND(BOOST_MSVC,<1300)
+/* See
+ * http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_MPL
+ * Item 5.6, Beware of the 'early template instantiation' trap.
+ */
+
+template<typename Type,typename Construct>
+struct prevent_eti
+{
+  typedef typename mpl::if_<
+    mpl::aux::msvc_never_true<Type>,
+    mpl::integral_c<int,0>,
+    Construct
+  >::type type;
+};
+#else
+template<typename Type,typename Construct>
+struct prevent_eti
+{
+  typedef Construct type;
+};
+#endif
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif